Q. Which one of the following correctly differentiates dark matter from dark energy?

[A] Dark matter interacts with light, while dark energy does not.

[B] Dark matter slows down cosmic expansion, while dark energy speeds it up.

[C] Dark matter is more abundant than dark energy in the universe.

[D] Dark matter is responsible for cosmic acceleration, while dark energy holds galaxies together.

Answer: B
Notes:

Explanation – Dark matter exerts a gravitational pull, acting as an attractive force. It helps hold galaxies together and slows down the expansion of the universe to some extent. Dark energy, on the other hand, acts as a repulsive force or anti-gravity, driving the accelerated expansion of the universe.

Source: The Hindu

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